*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0a0a0a;
  --bg-panel: #111111;
  --border: #2a2a2a;
  --border-glow: #444444;
  --text: #e8e8e8;
  --text-dim: #666666;
  --text-muted: #888888;
  --accent: #ffffff;
  --mono: 'Share Tech Mono', 'Courier New', monospace;
  --sans: 'Noto Sans SC', system-ui, sans-serif;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.5;
  overflow-x: hidden;
  position: relative;
}

.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(255, 255, 255, 0.015) 2px,
    rgba(255, 255, 255, 0.015) 4px
  );
}

.grid-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 20%, transparent 70%);
}

.container {
  position: relative;
  z-index: 1;
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

/* Header */
.header {
  position: relative;
  text-align: center;
  padding: 28px 20px 24px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, transparent 100%);
}

.header-corner {
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--accent);
  border-style: solid;
}

.header-corner.tl { top: -1px; left: -1px; border-width: 2px 0 0 2px; }
.header-corner.tr { top: -1px; right: -1px; border-width: 2px 2px 0 0; }
.header-corner.bl { bottom: -1px; left: -1px; border-width: 0 0 2px 2px; }
.header-corner.br { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; }

.sys-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.title {
  font-family: var(--sans);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.15);
}

.subtitle {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  margin-top: 6px;
}

.user-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 4px 14px;
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.tag-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.6);
}

/* Panel */
.panel {
  border: 1px solid var(--border);
  background: var(--bg-panel);
  margin-bottom: 16px;
  position: relative;
}

.panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.panel-id {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-dim);
}

.panel-title {
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  flex: 1;
}

.status-indicator,
.refresh-tag,
.mode-tag {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}

.pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 4px rgba(255, 255, 255, 0.8); }
  50% { opacity: 0.3; box-shadow: none; }
}

/* Runtime */
.runtime-display {
  padding: 24px 16px;
  text-align: center;
}

.runtime-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.runtime-value {
  font-family: var(--mono);
  font-size: 2.8rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-shadow: 0 0 30px rgba(255, 255, 255, 0.2);
  line-height: 1;
  transition: opacity 0.15s;
}

.runtime-value.tick {
  opacity: 0.85;
}

.runtime-sub {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  margin-top: 10px;
}

.runtime-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.meta-divider {
  color: var(--border-glow);
}

/* Data Grid */
.data-grid {
  padding: 8px 0;
}

.data-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: baseline;
  gap: 8px;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.data-item:last-child {
  border-bottom: none;
}

.data-item.total {
  background: rgba(255, 255, 255, 0.03);
  border-top: 1px solid var(--border-glow);
  border-bottom: 1px solid var(--border-glow);
}

.data-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.data-value {
  font-family: var(--mono);
  font-size: 1.4rem;
  color: var(--text);
  text-align: right;
  min-width: 60px;
  transition: transform 0.2s, color 0.2s;
}

.data-value.highlight {
  color: var(--accent);
}

.data-value.accent {
  color: #cccccc;
}

.data-value.total-value {
  font-size: 1.8rem;
  color: var(--accent);
  text-shadow: 0 0 15px rgba(255, 255, 255, 0.25);
}

.data-value.flash {
  animation: valueFlash 0.4s ease;
}

@keyframes valueFlash {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); color: var(--accent); }
  100% { transform: scale(1); }
}

.data-unit {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  min-width: 16px;
}

.rate-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.rate-divider {
  color: var(--border-glow);
}

.hidden {
  display: none !important;
}

/* History */
.history-list {
  list-style: none;
  max-height: 220px;
  overflow-y: auto;
}

.history-empty {
  padding: 20px 16px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

.history-item {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 10px;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.history-seq {
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.history-time {
  color: var(--text-muted);
}

.history-amount {
  color: var(--accent);
  text-align: right;
}

.history-delete {
  width: 24px;
  height: 24px;
  padding: 0;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.history-delete:hover {
  border-color: var(--border-glow);
  color: var(--text);
}

.datetime-input {
  width: 100%;
  margin-bottom: 12px;
  padding: 12px 14px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  outline: none;
  color-scheme: dark;
}

.datetime-input:focus {
  border-color: var(--border-glow);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.06);
}

/* Admin lock */
.admin-locked,
.admin-controls {
  padding: 20px 16px 16px;
}

.lock-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-align: center;
  margin-bottom: 16px;
  line-height: 1.6;
}

.lock-btn {
  width: 100%;
  margin-top: 12px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.lock-btn:hover {
  border-color: var(--border-glow);
  color: var(--text-muted);
}

/* Return Form */
.return-form {
  padding: 20px 16px 12px;
}

.input-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.input-group {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.4);
  margin-bottom: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group:focus-within {
  border-color: var(--border-glow);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.06);
}

.return-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 1.2rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  -moz-appearance: textfield;
}

.return-input::-webkit-outer-spin-button,
.return-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.return-input::placeholder {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.input-suffix {
  padding: 0 16px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  border-left: 1px solid var(--border);
}

.submit-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 14px;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
  position: relative;
  overflow: hidden;
}

.submit-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(-100%);
  transition: transform 0.3s;
}

.submit-btn:hover::before,
.submit-btn:active::before {
  transform: translateX(0);
}

.submit-btn:active {
  transform: scale(0.98);
}

.submit-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-arrow {
  transition: transform 0.2s;
}

.submit-btn:hover .btn-arrow {
  transform: translateX(4px);
}

.form-hint {
  padding: 0 16px 16px;
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  text-align: center;
}

.form-hint.error {
  color: #999999;
}

/* Footer */
.footer {
  text-align: center;
  padding-top: 8px;
}

.footer-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin-bottom: 16px;
}

.footer p {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
}

.footer-sub {
  margin-top: 4px;
  color: var(--text-muted) !important;
}

.reset-btn {
  margin-top: 20px;
  padding: 8px 18px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, box-shadow 0.2s;
}

.reset-btn:hover {
  border-color: var(--border-glow);
  color: var(--text-muted);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.05);
}

.reset-btn:active {
  transform: scale(0.98);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 10px 20px;
  background: var(--bg-panel);
  border: 1px solid var(--border-glow);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text);
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  z-index: 200;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Responsive */
@media (min-width: 480px) {
  .container {
    padding: 32px 24px 48px;
  }

  .title {
    font-size: 1.75rem;
  }

  .runtime-value {
    font-size: 3.2rem;
  }
}